A key component in
Missile Countermeasures Devices (MCD) and Active Protection
Systems (APS) is the threat warning. The most mature system is the
laser warning device.

VVR-2 produced by Goodrich, has been
deployed with USMC LAV reconnaissance vehicles since 1996, and are
currently being augmented by the more advanced VVR-3, which is
capable of detecting laser rangefinders, designators as well as
beam-riding missiles at a 360 degrees azimuth and 55 deg.
elevation. A similar system developed by EFW, is the Threat
Detection System (TDS) a multi-spectral system that can
detect both laser and IR illuminators. Offering high accuracy, the
system has an expanded coverage of 110 degrees in elevation and
360 degrees azimuth.